An interdisciplinary intervention to prevent falls in community-dwelling elderly persons: protocol of a cluster-randomized trial [Pre-Falls] - Blank, Wolfgang A.; Freiberger, Ellen; Siegrist, Monika; Landendörfer, Peter; Linde, Klaus; Schuster, Tibor; Pfeifer, Klaus; Schneider, Antonius; Halle, Martin (BMC Geriatrics, 2011)